Ok so this tank was a angelfish tank for years, a few weeks ago I decided I wanted to make a switch to discus. I switched the tank from gravel to sand, planted it, and bought a few tetras. It's been running for at least three weeks. The ph is 7.0, the nitrates NO2 is 0ppm but the nitrites NO3 is over 140ppm!! This is also my first time with the API master kit but I did it three times because I was so shocked and it was the same every time. What do you do for high nitrites? Could it be the sand? What makes them high? Everything else is perfect and the tank is not dirty.
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Sent from my iPhone using Aquarium Advice